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Metal ion

Peitao Xiao, Fanxing Bu, Ranran Zhao, Mohamed F Aly Aboud, Imran Shakir, Yuxi Xu
Synthesis of ultrasmall metal-organic frameworks (MOFs) nanoparticles has been widely recognized as a promising route to greatly enhance their properties but remains a considerable challenge. Herein, we report one facile and effective spatial-confined thermal pulverization strategy to successfully transform bulk Co-MOFs particles into sub-5 nm nanocrystals encapsulated within N-doped carbon/graphene (NC/G) by using conducting polymer coated Co-MOFs/graphene oxide as precursors. This strategy involves a feasible mechanism: calcination of Co-MOFs at proper temperature in air induces the partial thermal collapse/distortion of the framework, while the uniform coating of conducting polymer can significantly improve the decomposition temperature and maintain the component stability of Co-MOFs, thus leading to the pulverization of bulk Co-MOFs particles into ultrasmall nanocrystals without oxidation...
March 20, 2018: ACS Nano
Vincent A Spata, Emily A Carter
Nanoparticles synthesized from plasmonic metals can absorb low-energy light, producing an oscillation/excitation of their valence electron density that can be utilized in chemical conversions. For example, heterogeneous photocatalysis can be achieved within heterometallic antenna-reactor complexes (HMARCs), by coupling a reactive center at which a chemical reaction occurs to a plasmonic nanoparticle that acts as a light-absorbing antenna. For example, HMARCs composed of aluminum antennae and palladium (Pd) reactive centers have been demonstrated recently to catalyze selective hydrogenation of acetylene to ethylene...
March 20, 2018: ACS Nano
Jacqueline M Zaengle-Barone, Abigail C Jackson, David M Besse, Bradford Becken, Mehreen Arshad, Patrick C Seed, Katherine J Franz
The unabated rise in bacterial resistance to conventional antibiotics, coupled with collateral damage to normal flora incurred by overuse of broad-spectrum antibiotics, necessitates the development of new antimicrobials targeted against pathogenic organisms. Here, we explore the antibacterial outcomes and mode of action of a prochelator that exploits the production of β-lactamase enzymes by drug-resistant bacteria to convert a non-toxic compound into a metal-binding antimicrobial agent directly within the microenvironment of pathogenic organisms...
March 20, 2018: ACS Infectious Diseases
Shan-Shan Li, Wen-Yi Zhou, Min Jiang, Zheng Guo, Jinhuai Liu, Lizhi Zhang, Xing-Jiu Huang
Developing a new ultra-sensitive interface to detect As(III) is highly desirable because of its seriously toxic and low concentration in drinking water. Recently, Fe3O4 nanoparticles of high adsorption toward As(III) become very promising to be such an interface, which is still limited by the poor understanding of their surface physicochemical properties. Herein, we report that dumbbell-like Au/Fe3O4 nanoparticles, when being modified the screen-printed carbon electrode, can serve as an efficient sensing interface for As(III) detection with an excellent sensitivity of 9...
March 20, 2018: Analytical Chemistry
Jeroen Sniekers, Pieter Geysens, Tom Vander Hoogerstraete, Luc Van Meervelt, Jan Fransaer, Koen Binnemans
Cobalt(ii)-containing ionic liquids were synthesized using N,N-dimethylformamide, N-methylpyrrolidone (NMP), dimethylsulfoxide (DMSO), N,N-dimethylacetamide (DMAc), pyridine-N-oxide (py-O), 1,10-phenanthroline (phen), ethylenediamine (en) and dimethylimidazolidinone (DMI) as ligands. The weakly coordinating bis(trifluoromethylsulfonyl)imide (Tf2N-) was used as a counter anion. Several compounds had a melting temperature below 100 °C, and the compound [Co(DMAc)6][Tf2N]2 was liquid at room temperature, with a viscosity of only 18 mPa s at 80 °C...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Myeongsang Lee, Jae In Kim, Sungsoo Na, Kilho Eom
Amyloid β (Aβ) aggregates, which are a hallmark for neurodegenerative disease, are formed through a self-assembly process such as aggregation of Aβ peptide chains. This aggregation process depends on the solvent conditions under which the proteins are aggregated. Nevertheless, the underlying mechanism of the ionic effect on the formation and stability of amyloid aggregates has not been fully understood. Here, we report how metal ions play a role in the formation and stability of Aβ aggregates at different length scales, i...
March 20, 2018: Physical Chemistry Chemical Physics: PCCP
Jin Zheng, Xiao-Qian Gu, Tai-Jie Zhang, Hui-Hui Liu, Qiao-Jing Ou, Chang-Lian Peng
Seagrasses play an important role in coastal marine ecosystems, but they have been increasingly threatened by human activities. In recent years, seagrass communities have rapidly degenerated in the coastal marine ecosystems of China. To identify the reasons for the decline in seagrasses, the phytotoxic effects of trace metals (Cu, Cd and Zn) on the seagrass Thalassia hemprichii were investigated, and the environmental contents of the metals were analyzed where the seagrass grows. The results showed that leaf necrosis in T...
March 19, 2018: Ecotoxicology
Md Saddam Hossain, Takahiro Tanaka, Kazuyoshi Takagi, Junji Hayashi, Mamoru Wakayama
In the present study, we purified α-amino acid ester hydrolase (AEH) from cell-free extracts of the Stenotrophomonas maltophilia strain HS1. The approximately 70-kDa AEH from S. maltophilia HS1 (SmAEH) was homogeneous in sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) analyses, and was present as a tetramer in gel-filtration experiments. The activity of the SmAEH enzyme was then determined by monitoring the synthesis of the antihypertensive agent dipeptide isoleucyl-tryptophan (Ile-Trp) from isoleucyl methyl ester (Ile-OMe) and tryptophan (Trp)...
March 2018: 3 Biotech
Weixiang Liu, Yukun Qin, Song Liu, Ronge Xing, Huahua Yu, Xiaolin Chen, Kecheng Li, Pengcheng Li
Based on a condensation reaction, a chitosan-derivative-bearing amino pyridine group was prepared and subsequently followed by coordination with cupric ions, zinc ions and nickel ions to synthesize chitosan metal complexes. The calculations using the density functional theory (DFT) show that the copper ions and nickel ions underwent dsp2 hybridization, the zinc ions underwent sp3 hybridization, and they all formed a coordination bond with the carbon atom in the p-π conjugate group. The antifungal properties of O-CSPX-M against Phytophthora capsici (P...
March 19, 2018: Scientific Reports
Gee Yeong Kim, Alessandro Senocrate, Tae-Youl Yang, Giuliano Gregori, Michael Grätzel, Joachim Maier
In the same way as electron transport is crucial for information technology, ion transport is a key phenomenon in the context of energy research. To be able to tune ion conduction by light would open up opportunities for a wide realm of new applications, but it has been challenging to provide clear evidence for such an effect. Here we show through various techniques, such as transference-number measurements, permeation studies, stoichiometric variations, Hall effect experiments and the use of blocking electrodes, that light excitation enhances by several orders of magnitude the ionic conductivity of methylammonium lead iodide, the archetypal metal halide photovoltaic material...
March 19, 2018: Nature Materials
Zengyin Zhu, Mancheng Zhang, Wei Wang, Qing Zhou, Fuqiang Liu
A series of magnetic multi-amine resins (MMARs, named E1D9-E9D1) was proposed for the removal of tetracycline (TC) and Cu(II) in sole and binary solutions. Results showed that the N content of the resins increased sharply from 1.7% to 15.49%, and the BET surface areas decreased from 1433.4 m2 /g to 8.9 m2 /g with methyl acrylate ratio increasing from E1D9 to E9D1. Their adsorption capacities for TC and Cu(II) could reach 0.243 and 0.453 mmol/g, respectively. The adsorption isotherms of TC onto MMARs transformed from heterogeneous adsorption to monolayer-type adsorption with DVB monomer ratio in resin matrix decrease, suggesting the dominant physical adsorption between TC and benzene rings...
March 19, 2018: Scientific Reports
Katrin Pollmann, Sabine Kutschke, Sabine Matys, Johannes Raff, Gregor Hlawacek, Franziska L Lederer
The increasing demand of different essential metals as a consequence of the development of new technologies, especially in the so called "low carbon technologies" require the development of innovative technologies that enable an economic and environmentally friendly metal recovery from primary and secondary resources. There is serious concern that the demand of some critical elements might exceed the present supply within a few years, thus necessitating the development of novel strategies and technologies to meet the requirements of industry and society...
March 16, 2018: Biotechnology Advances
C Binot, C-H Chouard
The existence of an information vector common to very different pathologies is the hypothesis of one of us, the argumentation and discussion of which we present here. It is a mesomorphic state of material called liquid crystal. The liquid-ordered (Lo) phase, made up of membrane rafts mediated by cholesterol, lies at the center of our concept. This mesophase is either preexistent and then modified by the pathogenic process, or initiated by the latter. The most notable disorders involved are Alzheimer's, Parkinson's, Charcot and Creutzfeldt-Jakob diseases, flu-like illnesses and acquired immunodeficiency syndrome (AIDS), although this list may well be extended to include other anisotropic, birefringent amyloid proteinopathies, which have properties compatible with those of liquid crystals...
March 16, 2018: Revue Neurologique
Ewelina Stefanovic, Olivia McAuliffe
BACKGROUND: Strains of Lactobacillus paracasei are present in many diverse environments, including dairy and plant materials and the intestinal tracts of humans and animals. Their adaptation to various niches is correlated to intra-species diversity at the genomic and metabolic level. In this study, we compared the genome sequences of three L. paracasei strains isolated from mature Cheddar cheeses, two of which (DPC4206 and DPC4536) shared the same genomic fingerprint by PFGE, but demonstrated varying metabolic capabilities...
March 20, 2018: BMC Genomics
Zhang Cai, Hang Wen, Sridhar Komarneni, Li Li
Produced or flowback waters from Marcellus Shale gas extraction (MSWs) typically are highly saline and contain chemicals including trace metals, which pose significant concerns on water quality. The natural attenuation of MSW chemicals in groundwater is poorly understood due to the complex interactions between aquifer minerals and MSWs, limiting our capabilities to monitor and predict. Here we combine flow-through experiments and process-based reactive transport modeling to understand mechanisms and quantify the retention of MSW chemicals in a quartz (Qtz) column, a calcite-rich (Cal) column, and a clay-rich (Vrm, vermiculite) column...
March 7, 2018: Science of the Total Environment
Yanshuai Xing, Xiaoshuang Meng, Lei Wang, Junjie Zhang, Zijing Wu, Xinying Gong, Chenye Wang, Hongwen Sun
Triazole contaminants in water and soil environments can form complexes with metal ions, and therefore affect the bioavailability and toxicity of some heavy metals. In present study, significant increase of copper (Cu) uptake by earthworm (Eisenia fetida) was observed when combined pollution of benzotriazole (BTR) presented in soil. For instance, Cu accumulation in earthworms increased 55% approximately when BTR presented at the BTR/Cu molar ratio of 1:2.5. While the single Cu exposure (at 32 mg kg-1 in soil) resulted in increased malondialdehyde (MDA) content in earthworms from 0...
March 12, 2018: Journal of Hazardous Materials
Lin Jin, Aaron E Engelhart, Katarzyna P Adamala, Jack W Szostak
Liposomes containing single-chain amphiphiles, particularly fatty acids, exhibit distinct properties compared to those containing diacylphospholipids due to the unique chemical properties of these amphiphiles. In particular, fatty acid liposomes enhance dynamic character, due to the relatively high solubility of single-chain amphiphiles. Similarly, liposomes containing free fatty acids are more sensitive to salt and divalent cations, due to the strong interactions between the carboxylic acid head groups and metal ions...
February 9, 2018: Journal of Visualized Experiments: JoVE
Yang Wang, Xueping Kong, Wei Xu, Fengrui Jiang, Bao Li, Lixin Wu
A series of triol ligand [CH3 C(CH2 OH)3 ] covalently decorated polyoxometalates (POMs), which could be ascribed to the primary complexes with structural formulas {M2 [Mo2 O4 (CH3 C(CH2 O)3 )2 ]3 }2- (M = Cu2+ , Co2+ , Ni2+ , Zn2+ ), have been synthesized in organic solvents. Single-crystal X-ray structural analysis reveals that the synthesized polyanionic clusters are comprised of three {Mo2 } units and two divalent transition-metal ions connecting to each other in an alternating style, where all {Mo2 } blocks were covalently decorated by two triol ligands in the trans conformation...
March 19, 2018: Inorganic Chemistry
Meng-Ting Li, Xi-Ya Yang, Ji-Sen Li, Ning Sheng, Guo-Dong Liu, Jing-Quan Sha, Ya-Qian Lan
For exploring the multifold helical fabrication of polyoxometalate (POM)-based hybrid compounds, four POM-based crystalline compounds with different meso-helices, H3 [Ag27 (trz)16 (H2 O)6 ][SiW12 O40 ]2 ·5H2 O (1), H[Ag27 (trz)16 (H2 O)4 ][PW12 O40 ]2 ·2H2 O (2), [Ag23 (trz)14 (H2 O)2 ][HSiW12 O40 ] (3), and [Ag23 (trz)14 (H2 O)2 ][PW12 O40 ] (4), were successfully isolated by using the delicate 1,2,3-triazole ligand and silver ions in this work. Crystal analysis reveals that compounds 1 and 2 and compounds 3 and 4 are isomorphous and display 2-/4-fold mixed meso-helices and simple 2-fold meso-helices, respectively...
March 19, 2018: Inorganic Chemistry
Shin-Ichiro Kawano, Takafumi Murai, Takahiro Harada, Kentaro Tanaka
Columnar assemblies of liquid-crystalline (LC) macrocycles hold promise for the construction of nanochannels in fluid materials. Metal-assisted self-assembly is an efficient way to prepare LC macrocycles. A large π-conjugated ligand, 9,10-diphenylanthracene (DPA) bearing two β-diketones, was prepared as a building unit for the macrocycle, and a series of side chains were incorporated into the DPA to yield LC materials. The bis(β-diketone) ligands on DPA allow for the efficient formation of triangular 3:3 metallomacrocycles in the presence of square-planar Cu2+ ions...
March 19, 2018: Inorganic Chemistry
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